9 Maths Chapter 6 Exercise 6.1 in English

NCERT Solutions for class 9 Maths Chapter 6 Exercise 6.1 Lines and angles in English Medium in PDF form as well as study online options are given. Click Here to see Exercise 6.2 and Exercise 6.3 or move to Hindi Medium solutions.

9 Maths Chapter 6 Exercise 6.3 in English

NCERT Solutions for class 9 Maths Chapter 6 Exercise 6.3 Lines and angles free to use online or download to use it offline. Click here for Exercise 6.1 and Exercise 6.2 or if you want solutions in Hindi go for Hindi Medium sols.

9 Maths Chapter 6 Exercise 6.3 in Hindi

9 Maths Exercise 6.3 Lines and angles solutions in Hindi Medium. All the questions of exercise is explained properly by the Maths experts. Click here to see – प्रश्नावली 6.1 and प्रश्नावली 6.2 or go for English Medium Solutions.

Important Terms on Lines and Angles

Types of line lines

Intersecting lines: Two lines are said to be intersecting, if they intersect each other at one point.

Parallel lines: Lines in the same plane which do not intersect when produced on either side.

Transversal lines: It is a straight line which cuts two or more straight lines at distinct point.

Types of angles

Acute angle: An angle whose measure is less than 90 but more than 0.

Obtuse angle: An angle whose measure is more than 90 but less than 180.

Right angle: An angle whose measure is 90.

Straight angle: An angle whose measure is 180.

Reflex angle: An angle whose measure is more than 180 but less than 360.

Complete angle: An angle whose measure is 360.

Pair of angles

Complementary angles: Two angles are said to be complementary, if the sum of their measure is 90.

Supplementary angles: Two angles are said to be supplementary, if the sum of their measure is 180.

Adjacent angles: Two angles are called adjacent angles, if they have a common vertex and common arm.

Vertically opposite angles: Two angles are said to be a pair of vertically opposite angles, if their arms from two pairs of opposite rays.

If a transversal intersects two parallel lines, then

Each of the alternate interior angles is equal. (Converse is also true).

Each pair of interior angles on the same side of the transversal is supplementary. (Converse is also true).